Burring machine



j Aug. l2, 1930. F. J. scHuMcHl-:R 1,772,500

BURRING MACHINE Filed Jan. 10, 1928 y over the edge ofthe-supporting roller:

Y ably mounted.

Patented Aug. 12,l `1930 FREDERICK I. scHUivIAcHEE, or Los ANGELES, CALIFORNIA EUREING MACHINE Application filedlanuary 10, 1,928.v Serial No. 245,792.

Thisinvention relates to devices used for burring sheet metal. j

One of the objects of this invention.i`sfjmt'ofr provide a device by which a-piecev of sheet metal can be centralized quickly and" securely. l r

Another object isto provide a device whereby a centralized piece of material 'is rotat- Anot-her object is to provide a supporting roller and burring roller mounted in a frame and operatively interconnected to be actuated in unison. e I

Another object is to provide a burringv mechanism with its principal axis radially in relation to a rotating holder by which a piece of material disposedand rotated by the holder may be burred alongits edge by means of the radiallyl disposed burring mechanism. e e Y Another object is to arrange a support# ing roller and a primary burring roller swingably interconnected whereby the iburring roller may -be movedlto ka point spaced from the supporting roller to allow an `insertion of a piece of material to extend with its edge beyond the edge of the supporting roller and so that the burring roller may be pressed sidewiseagainst the edge of such inserted material; ino

Another object .is torprovide a cooperating secondary burring roller whereby aj-bentover edge of a piece of material lcan be burred ydown by moving the secondary burring rolll er radially against the edge of the material.

Other objects will appear fromthefollowing description and appended claims aswell as from .the accompanying drawing, in whichj y Fig. 1 `is a side elevation of a burring apparatus illustrating a rotating holder and burring rollers arranged according to this invention. 4

Fig. 2 is a top plan view of the burring ap-l paratus illustrated in Fig.l 1, showing the'sec- Y ondary burringroller mounted sidewise of.`

ing `roller to be moved radially in relation to the rotating holder, and the primaryburrrder to bendtheY edge., 1 ,e Y Y Y ,y 1

tom plate to be connected to `a cylindrical or` ing roller movable across the edge of an inserted material parallelfto the axis of the-rotating holder. 4 i e Fig. 43y is a fragmentary detail longitudinal cross section of the secondary burring roller with, its operating mechanismj y Fig. 4 is al detail side elevation of the secondary burring roller. f e

Fig. 5 is a fragmentary detail end elevation of the clamping mechanism for the rotating 60 holder. r

Fig. 6 isa fragmentary vdetail longitudinal section rillustrating the operatingv and adjusting mechanism for'the primary burring roller. e

Fig. 7 illustrates a piece of metal or sheet material with its edge bent over the edge of a supporting roller and withthe primary burring roller resting on top of the material to illustrate the manner in whichthepri-.H'm mary burring` is accomplished.

Fig. 8 illustrates a piece of sheet material clinched over the edge of a supporting roller with thesecondary burring roller in a position to show how the burring is completed by thelaction of the secondary burring roller."

Fig. 9 is a detail perspective view of a yielding centralizing roller., .Y

In connecting sheet metal. orV any other sheet` material, the edges ,of vatlange ork bot. 80

hollow body 'of any other shape are generally bent or rolled over to bring the material along the edges practicallyfolded upon itself, so that this folded-in edge of a Hang@ or bottom plate may be clinched over an outwardly bent or burrededge of a cylindrical or otherwise hollow body. e In Fig. l, for instance, a' piece. ofy sheet material 9 isillustrated as placed between 90 y the holding-plates-lO andy `11 with its edge indicated` at l2 extending over the edge of the supporting roller 13 to a point below the primary burring roller 14. I

yIn Fig. 7- a portion of apiece of sheety95 material, is 4illustrated between the edge of the supporting roller 13 and the primary theother burring roller,fthe secondaryburr-f burring roller 14. The burring roller isI provided with a flange portion 15 ina position to presethe edge ofthe material over' the lo cer - serves to press the face of the supporting roller `which in turn serves to produce frictional contact with the material to rotate the material through the rotating movement of the burring and supporting roller. The supporting lroller 13 is, for this reason, preferably provided with a knurled or some suitable gripping face indicated at 18 to prevent a slipping of` theinserted material when the burring roller 14 is moved so as to press the inserted material against the face 18. rThis frictional contact is used to maintain a'rotating move-l ment with the inserted material fortlie last action to finish the barring lof the edge. The yfinishing of the burring ofV the edge of the inserted material is accomplished by *a second burring roller movable in a radi a direction in relation to the inserted material.

This finishing is best understood by the illustration in Fig. 8. By moving the second burring roller 19 against the already bentover edge of the inserted material, the bent `over edge 16 is 'folded upon itself as the notched bui-ring roller 19 closes in upon this edge ofthe inserted material, so that the finished burring has the appearance illus trated in this figure.

For rotatably supporting any insertedflange of sheet metal or sheet material, the

Ves

two holding plates 19 and 11 are mounted centrally as indicated at 20, the lower plate on a pin mounted in the arm 21 of t-lie frame 22, and the upper plate 17 mounted on aV pin 23 in the arm 24 of the frame 22.y

The plates 10 and 11 can be moved towards and away from each other by the action or" a cam illustrated in Fig. 5. which the plate 11 is pivotally mounted, is

kshiftably disposed inthe arm 24- of the frame 22 to allow an axial movement of this pin 23 and therewith a movement of the plate 11 Y towards the plate 10 in the direction'oi` the arrow 25. A 'cotter pin 26 serves to hold the spring 27 against the shoulder 28 in the arm 24. rlhe spring presses the pin 23 normally and automatically against the cam 29.

By an actuating of the lever 30, the shaft 31 and therewith the cam 29 may be rotated to press upon the pin 23 against the pressure of the spring 27 toinove the pin and therewith the supporting plate 11 in the direction of the arrow 25. The cam 29 is moved to wed ge against the end of the pin 23 sufliciently to hold the plate 11 pressedtowards theb plate'10 and when a piece of sheet materialis roller is then moved towards ,the supporting 'the plates to be rotated with the plates.

The pin 23 on y secondary burring roller19.

a piece of material 9 is inserted between the holding and 11 `with its edge extending beyond the edge of the supporting roller 13, below the burring roller 14, as indicated at 12.

To assure a proper centralizing of around plate of sheet material, adjustable guiding rollersfare provided as illustrated in Fig. 2, indicated at 32 and 33. By setting these guidingrollers, smaller or larger plates can be inserted to be automatically centralized and turned about the axis concentric with the centers 20 of the holding plates 10 and 11. Either the frame 22 is made movable towards the frame 34, or the trame 34 is made movable towards the frame 22, so that any centralizing of material between `the plates l. 10 and 11 brings the edge of such inserted material in proper relation to the supporting roller 13 andburring roller`14.

The secondary burring roller, illustrated in detailin Fig. 4, is notched in a peculiar wa'y to facilitate a desired burring. A top flange 35 is formed in this secondary burring roller 19,l having a smooth underside 36 against whichthe top surface 37 of an inserted mw terial .may iest. rlhe opposite face of the lower flange 38 is first generally slanted in a downward direction, indicated at 39. ln addition to this, the slanting face 39 is concaved or cut out, as indicated at 40. The lower edge 41 of this curved or grooved recess v40 is in a position to allow the lower edge 42 of the already bent material to slide in between the smooth surface 36 of the upper flange 35V and the loweredge 41. Since thebent edge of the inserted material rests onthe sharp edge of the supporting roller 13, a pressing or moving of the secondary roller 19 against the bent'edge of the inserted material results in a gradual curving of the bent edge 42V as this bent edge gradually slants over and into the. curved groove 40 in the slant-ing face 39 of the lower flange 33 of the They secondary burring roller 19 is normally held ininoperative position under the tension jof the rspring `43, as illustrated in dctail in Fig. y3. A. lever 44 engages the shouldered end 45 of the pin 46 carrying the burr- A Y ing roller 19.

The spring is inserted into the housing 47 to restwith one end against ythe shoulder 48, while the pin 49 rests against the opposite end of the spring. i By moving the lever in the direction of the arrow 5() against the tension of the spring 43, the burr- `ing roller can be brought to bear against the edge of an inserted material in the manner described above.

An inserted material is, therefore, first placed in a flat condition between the holding. plates 1() and 11. The primary burring roller13 by means ofthe movable .frame portion 51 pivotally mounted at 52 on the main ing fac-e of said supporting roller and having a {lange-like portion adapted to move p ast the outer edge ,of the supporting roller'whereby a burring of material can be produced when disposed between the holding members to extend over the edge of said supporting roller, the said cylindrical portion of the burring roller adapted to co-act with the slant-ing face of the supporting roller for firmly engaging inserted materialin order to rotate the material with the holding members.

5. In a burring machine, holding members mounted to rotate around a common axis and having engaging faces opposite and movable towards each other, a supporting roller disposed beyond the outer periphery of the holding members with its axis in a slanting direction in relation to the axis of the holding members and also slanting in a radial direction in relation to the holding members, the roller having a conical face in alignment with the engaging face of one of the holding members, a burring roller disposed with its axis in a radial direction in relation to the holding members and movable towardsthe supporting roller, the burring roller having a cylindrical portion to co-act with the slanting face of said supporting roller and having a flange-like portion adapted to move past the outer edgeof the supporting roller whereby a burring of material can be produced when disposed between the holding members to extend over theedge of said supporting roller, the said. cylindrical portion of the barring roller adapted to co-act with the slanting face of the supporting roller for firmly engaging inserted material in order to rotate the material with the holding members, and a secondary burring roller mounted sidewise of the first-named burring roller for a movement in a plane parallel to the engaging faces of the holding members adapted to be forced against the alreadybent edge of inserted material fora further burring while the material is rotated between the rst-named burring roller and said supporting roller.

6. In a burring machine, holding members ymounted to rotatearound a commonaxis and having engaging faces opposite and movable towards each other, a supporting roller disposed beyond the outer periphery of the holding members with its axis in a slanting direcn tion in relation to the axis of the holding members and also slanting in a radial direction in relation to the holding members, the roller having a conical face in alignment with the engaging face of one of the holding members, a burring roller disposed with its axis in a radial direction in relation to the holding members yand movable towards the supporting roller, the burring roller having a cylindrical portion to co-act with the slanting face of saidfsupporting roller and having a flange-like portion adapted to move past the outer edge of the supporting roller along the edges whereby a burring of material can be produced when disposed between the holding members to extend over the edge of said supportingl roller, the said cylindrical portion of the burring roller adapted to co-act with the slanting face of the supporting roller for rmly engaging inserted material in order to rotate the material withvthe holding inembers, a secondary burring roller mounted sidewise of the irst-named burring roller for a movement in a plane parallel to the engaging faces of the .holding members adaptedV to be forced against the already bent edge of inserted material for a further burring while the material is rotated between the first-named burring roller and saidA supporting roller, and operating means for actuating the supporting roller and first-named burring roller. i

7 In a burring machine, rcooperating holding members rotatable around a common axis and movable towards each other, controlling means for releasably moving the said members towards each other, a supporting roller disposed beyond the outerperiphery and with its axis in a slanting radial direction in relation to and inclined to the plane of said holding members, a burring roller operatively connected with said supporting roller and disposed in a direct radial direction in relation to said holding members and adapted to move towards the supporting roller, and centralizing rollers movable in a plane transversely to the axis of the holding members whereby inserted material can be centralized preparatory to being engaged between the holding members.

8. In a burring machine, cooperating holding members rotatable around a common axis and movable towards each other, controlling means for releasably moving the said meinbers towards each other, a supporting roller disposed beyond the outer periphery and with its to said holding members, a burring roller operatively rconnected with said supporting roller Land also disposed in a radial direction in relation to said holding members and adapted to move towards the supporting roller, and centralizing rollers with their periphery movable in a plane transverselyto the'a-xis of the holding members whereby inserted material can be centralized preparatory to being engaged between the holding members, the eentralizing rollers being mounted pivotally and yieldably whereby an inserted material may pass the rollers without undue friction regardless of unevenness of the inserted material.

9. In a burring machine, cooperating holding members rotatable around a common axis and movable towards each other, controlling means for releasably moving the said members towards each other, a supporting roller disposed beyond the outer periphery an axis in a radial direction in relation with its axis in a radial direction in relation to said holding members, a burring roller operatively connected with said supporting roller and also disposed in a radial direction in relation to said holding members and` adapted to move towards thesupporting roller, centralizing rollers with their periphery? movable in a plane transversely to` the axis of the holding members whereby in-` serted material can be ycentralized preparatory to being engaged between the holding members, the centralizing rollers being mounted pivotallyand yieldably whereby an inserted material'vmay pass the rollers without undue friction regardless of unevenness along the edges of the inserted material, and l separate clamping frame structures for the centralizing rollers adapted to be/set and adjusted in a plane radially to the holding members.

10. In a burring machine, cooperating` holding members rotatable around a common axis and movable towards each other, controlling means for releasably moving the said a members towards each other, a supporting roller disposed beyond the outer periphery and with its axis in a radial direction in relation to said holding members, a burring roller operatively connected with said supporting roller and also disposed ina radial direction in relation to said holding members and adapted to move towards the supporting roller, centralizing rollerswith their periphery movable in a plane transversely to the axis of the holding members whereby insertedv material can be centralized preparatory to being engaged between the holding members, the contralizing rollers being mounted pivotally and yieldably whereby an inserted material may pass the rollers without undue friction regardless of unevenness along the edges of the inserted material, and separate clamping frame structures for the centralizing rollers adapted to be set and adjusted in a plane radially to the holding `members and embodying secondary lmeans for finer adjustments of the rollers with respect to their pivotal mountings.

In testimony that I claim the foregoing as my invention I have signed my name.

FREDERICK J, SGHUMACHER. 

